Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/35378
標題: 模孔形狀對擠壓產品滯留時間分佈及其理化特性之研究
The Study of Die Shape on Residence Time Distribution and Physical and Chemical Properties of Extrudates
作者: 林育德
lin, yuh-der
關鍵字: Die shape;模孔形狀;RTD;extrusion;feed rate;screw speed;滯留時間分佈;擠壓;進料速率;螺軸轉速
出版社: 農業機械工程學系
摘要: 
In this research, four different die shapes (W,S,I and C) were
designed to investigate the effects on residence time
distributions. Also, the effects of process variables ( die
shape, feed rate and screw speed) on the extrudate''s properties
such as expansion ratios, bulk density, water solubility index,
water absorption index, break force and puncture force were
studied.The results of this research were:1. Extrusion die shape
was most influential in residence time distribution. The S-shape
die resulted the highest mean residence time and spread than
other dies. The I-shape die had the greatest vessel dispresion
number.2. The widthwise expansion ratio was highest in center
and lowest in boundary, and this phenomena was caused by the
flow pattern inside the dies.3. Mean residence time showed
significant positive correlation with extrudate''s sectional
expansion ratio, but significant negative correlation with
extrudate''s longitudinal expansion, bulk density and puncture
force. Spread of residence time distribution showed most
significant positive correlation with extrudate''s sectional
expansion ratio, however, significant negative correlation with
extrudate''s bulk density and puncture force.4. Increasing feed
rate resulted in an increase of extrudate''s sectional expansion
ratio, but decrease extrudate''s longitudinal expansion, bulk
density and puncture force. The increase of screw speed resulted
in increasing extrudate''s sectional expansion ratio, however,
decreasing extrudate''s puncture force.

本研究設計四個形狀不同的縫口形模孔,分別為W、S、I、C形,以探討模
孔形狀對擠壓滯留時間分佈的影響,及模孔形狀、進料速率、螺軸轉速對
產品特性(寬度膨發率、橫向膨發率、截面積膨發率、縱向膨發、假密度
、水溶性指標、吸水性指標、最大破碎力、穿刺力)之影響。實驗結果如
下:1. 模孔形狀對滯留時間分佈有極顯著的影響,S形模孔的平均滯留時
間最長,滯留時間分佈變域最大,而I形模孔的擴散數最好。2. 四種形狀
產品的寬度膨發率都有中間較高兩側較低,且左右呈對稱的趨勢,此為模
孔中間物料的流速較快所導致。3. 平均滯留時間對產品截面積膨發率有
顯著的正相關,對縱向膨發有極顯著的負相關,對假密度與產品穿刺力有
顯著的負相關。滯留時間分佈變域對截面積膨發率有極顯著的正相關,對
假密度有極顯著的負相關,對穿刺力有顯著的負相關。4. 進料速率增加
會導致產品膨發率增加、縱向膨發、假密度及穿刺力減少。螺軸轉速增加
會導致產品膨發率增加、穿刺力減少。
URI: http://hdl.handle.net/11455/35378
Appears in Collections:生物產業機電工程學系

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